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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
1 Roast in a roasting pan approximately 15 minutes per pound for medium-rare (a 3.5 pound roast will take about 45 minutes to cook) or to desired internal temperature. Preheat oven to 400Â°F. 2  Drizzle with olive oil, season with salt and pepper, and coat with garlic, herbs and breadcrumbs. 3  Roast in a roasting pan 20-35 minutes for medium-rare or to desired internal temperature.